Seeing the discarded masks of previous Golden Guards confirms that Belos has recycled and murdered his "nephew" dozens of times .
We finally see how Belos rose to power. He didn't save the Isles from "wild magic" chaos; he manufactured the chaos himself to trick witches into accepting the restrictive Coven system. Hunter’s Breaking Point [S2E16] Hollow Mind
By the end, Hunter is terrified and on the run. For the first time, he has nowhere to go, and his world is completely shattered. The Collector Steps into the Light Seeing the discarded masks of previous Golden Guards